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The section "Pay attention" indicates the conditions that should be taken into account to solve a specific situation that cannot always be solved by generally accepted methods.

Small sections «Interesting to know» will encourage you to search for information on your own, which will expand your horizons and help you understand the complex and mysterious world.

The textbook contains a sufficient number of tasks, examples of their solutions and answers.

Project work can be theoretical or experimental, individual and group. The duration of the project varies: from a lesson (mini-project), several days (short-term project) to a year (long-term project). The problematic questions and topics of the projects contained in the textbook are indicative.